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This study found that dermal papilla and peribulbar dermal sheath cup cells in mice can both induce hair follicle formation, suggesting they may have similar functional roles in hair growth.

This study found that human peptidylarginine deiminase type III is the predominant isoform in hair follicles and may modulate structural proteins during hair and hair follicle formation.

This study suggests that the keratins found in reptile and bird skin appendages evolved independently from mammalian hair keratins, highlighting convergent evolution in these species.

This study found that hair follicles undergo significant molecular changes with age, notably a decline in keratins and keratin-associated proteins, which may contribute to age-related hair alterations.

This study found that telogen, a resting phase of the hair follicle cycle, is characterized by dynamic gene expression, including enhanced cholesterol metabolism and immune signaling, suggesting it is an active regulatory phase despite its quiescent appearance.

This study reports a mutation in the U2HR gene causing Marie Unna hereditary hypotrichosis in a Turkish family and notes eyebrow loss as a diagnostic clue.

This study found that PGA-4HGF nanoparticles enhanced hair growth in mice more effectively than 4HGF alone by increasing anagen phase duration and dermal papilla cell proliferation.

Human hair keratin has a 40% α-helix structure that changes to a random coil in 8 M urea.

This paper discusses insulin resistance's effects on skin physiology, emphasizes its role in keratinocyte balance, and reports no new experimental findings.

This research review observed that topical hormone replacement therapy, particularly estradiol and estradiol-testosterone combinations, significantly increased Type I and III collagen synthesis in the skin of postmenopausal women, suggesting benefits against collagen loss-related skin aging effects such as reduced elasticity and increased dryness.

This study identified non-structural proteins in preschool children's scalp hair that suggest potential biomarkers for brain development, immune function, and stress response with heritability and age-related differences.

This study found that UV radiation exposure during a simulated Brazilian summer caused more significant mechanical damage to natural hair than bleaching, although both caused comparable structural alterations, with double bleaching leading to the most severe protein degradation.

African hair is more fragile due to its unique shape and internal structure.

This study found that sustained intracellular acidosis in mice was associated with shortened lifespan, early aging signs, and impaired autophagy.

This study analyzed how oxidative hair dye leaches from pigmented and nonpigmented hair during wash cycles, finding that melanin influences the dye deposition and leaching processes.

This study found that, compared to oxidative treatments, reductive perm-waving more severely impacts the intermediate filaments in European human hair, while both treatments alter denaturation kinetics in a first-order manner.

This review discusses the heterogeneity of dermal fibroblasts in healthy mouse and human skin and reports no clinical results; the authors highlight potential insights into physiological and pathological wound healing.

This study observed that skin dryness does not seem to indicate impaired epidermal barrier function, as there was no negative correlation between stratum corneum water content and transepidermal water loss.

Mutations in keratin genes may link hair disorders to dental decay.

This study analyzes the fine structure and protein distribution in monotreme hairs, finding similarities with other mammals and detailing unique immunocytochemical features in their inner root sheaths.

This study found distinct gene expression profiles in alopecia areata-affected skin, suggesting T-cell mediated immune responses and unique gene profiles between different stages of the disease.

This study identified trichohyalin as an early differentiation marker in hair follicles, with potential structural roles related to alpha-helical formations, based on the partial characterization of its cDNA in sheep.

This study suggests that TGase 3 may contribute to hair fiber scaffolding by forming specific isopeptide bonds between keratin intermediate filaments and keratin-associated proteins.

Hair proteins change location and structure as hair cells mature.

In this study, researchers found that follicular and epidermal transglutaminases are biochemically and immunologically distinct, suggesting the possibility of selectively modifying hair or epidermal proteins.

This study found that the molecular structures of α-keratin and collagen in a 2,100-year-old female cadaver's hair and tendon were preserved, while fibrous molecule aggregations were altered.

This study found that 363 genes were differentially expressed in alopecia areata skin compared to non-lesional skin, suggesting T-cell mediated immune responses and distinct gene profiles related to the disease's stage.

This review discusses the structural knowledge of wool keratin proteins and genes, reports no new findings, and highlights promising directions such as keratin gene regulation.

This study found that a proteomics-based approach can effectively distinguish between scalp and pubic hair by identifying unique protein signatures, providing a more quantitative and objective method for tracing hair contamination sources in GMP manufacturing and forensic investigations.

Keratin-associated proteins are crucial for hair strength and structure.